Coordination polymerization Brookhart

This reaction proceeds in high yields, and has also been used to obtain multifunctional UPy-PDMS from commercially available precursors. Moreover, UPy 2g has been copolymerized with 1-hexene in a coordination polymerization with Brookhart s catalyst, resulting in UPy-containing polyolefins [18]. 

A similar inhibition, but not cessation, of polymerization was observed by Brookhart in his work on the copolymerization of ethylene with methyl acrylate that is catalyzed by cationic bisimine-Pd(II) complexes [9]. Here again, the coordination of the oxygen atom of the ester group of acrylate significantly slows down polymerization and leads to lower molecular weight materials (Eq. (3)). 

Once it was recognized that coordinative unsaturaiion could facilitate insertion, the widely accepted rule of thumb that only early metals could give efficient polymerization catalysts seemed shortsighted. Brookhart et and Gibson... 

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